1210123203531 has 12 divisors (see below), whose sum is σ = 1773513896616. Its totient is φ = 733408001920.

The previous prime is 1210123203511. The next prime is 1210123203547. The reversal of 1210123203531 is 1353023210121.

It is a happy number.

It is not a de Polignac number, because 1210123203531 - 2¹³ = 1210123195339 is a prime.

It is a super-2 number, since 2×1210123203531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1210123203511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1666836006 + ... + 1666836731.

It is an arithmetic number, because the mean of its divisors is an integer number (147792824718).

Almost surely, 2^{1210123203531} is an apocalyptic number.

1210123203531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1210123203531 is a deficient number, since it is larger than the sum of its proper divisors (563390693085).

1210123203531 is a wasteful number, since it uses less digits than its factorization.

1210123203531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333672762 (or 3333672751 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 1210123203531 its reverse (1353023210121), we get a palindrome (2563146413652).

The spelling of 1210123203531 in words is "one trillion, two hundred ten billion, one hundred twenty-three million, two hundred three thousand, five hundred thirty-one".